Please put a Turing complete tag on this. I was on the train and when I played this I had to start furiously processing. Everyone else gave me strange looks and were saying things like "what the towerquest" and "call the sysadmin". I dropped my Let's note DVD and everyone around me saw this level. Now there is a whole train of Turing machines computing together at this one level. This is all your fault, you could have prevented this if you had just tagged this post Turing complete.
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To play this, you need to download TowerGame.